Display panel, display device, and electronic device

ABSTRACT

A display device includes: a display panel including display elements each including a light emitting unit and a drive circuit for driving the light emitting unit, the display elements being arranged in a two-dimensional matrix on a substrate; and a luminance correction unit for correcting luminances of the display elements in display of an image by the display panel by correcting a gradation value of a video signal, in which a partition (60) for guiding stray light from a light emitting unit to an optical sensor (4) provided on the display panel is provided between adjacent light emitting units of the display panel, and the luminance correction unit corrects a gradation value of a video signal associated with each of the display elements on the basis of a gradation value of an uncorrected video signal and a detection result from the optical sensor.

TECHNICAL FIELD

The present disclosure relates to a display panel, a display device, andan electronic device.

BACKGROUND ART

Display devices having display panels with organic electroluminescenceare recently receiving attention as display devices replacing liquidcrystal display devices. Display devices with organicelectroluminescence, which have characteristics of being self-luminousand low in power consumption and are considered to have sufficientresponsiveness to high-definition and high-speed video signals, haveintensively been developed for practical use and commercialized.Hereinafter, display devices with organic electroluminescence may simplyreferred to as “display devices”.

An active matrix display panel includes a plurality of display elementseach including a light emitting unit and a drive circuit for driving thelight emitting unit. For example, in the example illustrated in FIG. 1,a display element 3 includes a light emitting unit ELP and a drivecircuit constituted by three transistors and two capacitors, which is asimilar configuration to a drive circuit disclosed, for example, inJapanese Patent Application Laid-Open No. 2008-287141. The drive circuitis constituted by: a write transistor TR_(W), a drive transistor TR_(D),and an emission control transistor TR_(EL); and a retaining capacitanceC₁, and an auxiliary capacitance C₂. Note that the capacitance of thelight emitting unit ELP is represented by a symbol C_(EL).

CITATION LIST Patent Document

Patent Document 1: Japanese Patent Application Laid-Open No. 2008-287141

SUMMARY OF THE INVENTION Problems to be Solved by the Invention

The light emitting characteristics of display elements constituting adisplay device vary among different display elements depending on manyfactors such as variation in the characteristics of light emittingunits, variation in the resistance of wires connected with the lightemitting units, and variation in the characteristics of transistorsconstituting the drive circuits. These variations in the characteristicscause luminance unevenness in a display screen. Although a drivingmethod for compensating for variation in the characteristics oftransistors and the like are also proposed, the compensation is only forvariation in a specific element, and therefore the effect of improvementof luminance unevenness cannot be deemed to be sufficient. Foreliminating the luminance unevenness, such processes as detecting andcorrecting the light emitting state of each of the display elements.

An object of the present disclosure is therefore to provide a displaypanel capable of detecting the light emitting amount of each displayelement, a display device capable of correcting variation in the lightemitting characteristics of the display elements with use of the displaypanel, and an electronic device including the display device.

Solutions to Problems

A display panel according to a first aspect of the present disclosure toachieve the aforementioned object includes display elements eachincluding a light emitting unit and a drive circuit for driving thelight emitting unit, the display elements being arranged in atwo-dimensional matrix on a substrate, in which a partition for guidingstray light from a light emitting unit to an optical sensor provided onthe display panel is provided between adjacent light emitting units.

A display device according to the first aspect of the present disclosureto achieve the aforementioned object includes: a display panel includingdisplay elements each including a light emitting unit and a drivecircuit for driving the light emitting unit, the display elements beingarranged in a two-dimensional matrix on a substrate; and a luminancecorrection unit for correcting luminances of the display elements indisplay of an image by the display panel by correcting a gradation valueof a video signal, in which a partition for guiding stray light from alight emitting unit to an optical sensor provided on the display panelis provided between adjacent light emitting units of the display panel,and the luminance correction unit corrects a gradation value of a videosignal associated with each of the display elements on the basis of agradation value of an uncorrected video signal and a detection resultfrom the optical sensor.

A display device according to the first aspect of the present disclosureto achieve the aforementioned object is an electronic device including adisplay device, in which the display device includes: a display panelincluding display elements each including a light emitting unit and adrive circuit for driving the light emitting unit, the display elementsbeing arranged in a two-dimensional matrix on a substrate; and aluminance correction unit for correcting luminances of the displayelements in display of an image by the display panel by correcting agradation value of a video signal, in which a partition for guidingstray light from a light emitting unit to an optical sensor provided onthe display panel is provided between adjacent light emitting units ofthe display panel, and the luminance correction unit corrects agradation value of a video signal associated with each of the displayelements on the basis of a gradation value of an uncorrected videosignal and a detection result from the optical sensor.

Effects of the Invention

With the display panel according to the first aspect of the presentdisclosure, the light emitting amount of each of the display elements isdetected with use of stray light from the light emitting units. With thedisplay panel or the electronic device according to the first aspect ofthe present disclosure, the gradation value of a video signal can becorrected on the basis of a detection result, which enables correctionof the luminance unevenness. In addition, the effects mentioned in thepresent disclosure are exemplary only and are not limiting, andadditional effects may also be produced.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a conceptual diagram of a display device according to a firstembodiment.

FIG. 2 is a block diagram for explaining a luminance correction unitillustrated in FIG. 1.

FIG. 3 is a partial schematic cross-sectional view of a display panel ofthe first embodiment.

FIGS. 4A and 4B are partial schematic end views of a substrate and otherparts for explaining a method for forming partitions.

FIGS. 5A and 5B are partial schematic end views of the substrate andother parts for explaining the method for forming the partitionsfollowing FIG. 4A.

FIG. 6 is a partial schematic cross-sectional view of a display panelfor explaining the relation between stray light from a light emittingunit and a middle layer part of a partition.

FIG. 7 is a partial schematic cross-sectional view of the display panelfor explaining the relation between stray light from the light emittingunit and the middle layer part of the partition following FIG. 6.

FIG. 8 is a partial schematic cross-sectional view of a display panelfor explaining a partition of a second embodiment.

FIG. 9 is a partial schematic cross-sectional view of a display panelfor explaining a partition of a third embodiment.

FIGS. 10A to 10C are partial schematic end views of a substrate andother parts for explaining a method for forming partitions in the thirdembodiment.

FIG. 11 is a partial schematic cross-sectional view of a display panelfor explaining a partition of a modification of the third embodiment.

FIG. 12 is a partial schematic cross-sectional view of a display panelfor explaining a partition of a modification of the third embodiment.

FIG. 13 is a partial schematic cross-sectional view of a display panelfor explaining a partition of a modification of the third embodiment.

FIG. 14 is a partial schematic cross-sectional view of a display panelfor explaining a partition of a fourth embodiment.

FIG. 15 is a partial schematic cross-sectional view of a display panelfor explaining a partition of a fifth embodiment.

FIG. 16 is a partial schematic cross-sectional view of a display panelfor explaining a partition of a sixth embodiment.

FIG. 17 illustrates external views of a single-lens reflex digital stillcamera with interchangeable lenses, in which FIG. 17A is a front viewthereof and FIG. 17B is a rear view thereof.

FIG. 18 is an external view of a head mounted display.

FIG. 19 is an external view of a see-through head mounted display.

MODE FOR CARRYING OUT THE INVENTION

The present disclosure will now be described in connection withembodiments with reference to the drawings. The present disclosure isnot limited to the embodiments, but various numerical values andmaterials in the embodiments are merely examples. In the descriptionbelow, the same elements or elements having the same functions will bedesignated by the same reference numerals, and redundant descriptionwill not be repeated. Note that the description will be made in thefollowing order.

1. Overall description of display panel, display device, and electronicdevice according to present disclosure

2. First embodiment

3. Second embodiment

4. Third embodiment and modifications thereof

5. Fourth embodiment

6. Fifth embodiment

7. Sixth embodiment

8. Description of electronic device, and others

[1. Overall Description of Display Panel, Display Device, and ElectronicDevice According to Present Disclosure According to Present Disclosure]

In a display panel according to a first aspect of the presentdisclosure, a display panel used in a display device according to thefirst aspect of the present disclosure, and a display panel used in anelectronic device according to the first aspect of the presentdisclosure (hereinafter may be simply referred to as a “display panelaccording to the present disclosure”) a cross section of a partitiontaken along a virtual plane perpendicular to the longitudinal directionof the partition can have a tapered shape with the width decreasingtoward a display surface side or a tapered shape with the withincreasing toward the display surface side. In this case, the partitioncan include a stacked structure of two or more layers.

In the display panel of the present disclosure having the aforementionedpreferred configuration, a protective layer covering an entire surfaceincluding spaces between partitions is provided on an upper part of thepartitions, and a stacked structure constituting each of the partitionsincludes a material layer constituting an upper layer part, a materiallayer constituting a middle layer part, and a material layerconstituting a lower layer part stacked in this order from a displaysurface side.

In this case, a configuration in which the material layer constitutingthe upper layer part includes a material having a refractive index lowerthan that of a material of the protective layer, and the material layerconstituting the lower layer part includes a material having arefractive index higher than that of the material of the protectivelayer can be employed. Furthermore, a configuration in which thematerial layer constituting the middle layer part includes a materialhaving a refractive index lower than that of the material of the lowerlayer part can be employed.

Alternatively, in this case, a configuration in which the material layerconstituting the upper layer part includes a material having arefractive index higher than that of the protective layer, the materiallayer constituting the lower layer part includes the same material asthe upper layer part, and the material layer constituting the middlelayer part includes a material having a refractive index lower than thatof the material of the upper layer part and the lower layer part can beemployed.

Alternatively, in this case, a configuration in which the material layerconstituting the upper layer part includes a material having arefractive index lower than that of the protective layer, the materiallayer constituting the lower layer part includes the same material asthe upper layer part, and the material layer constituting the middlelayer part includes a material having a refractive index lower than thatof the material of the upper layer part and the lower layer part can beemployed.

In the display panel of the present disclosure having any of thepreferred configurations as described above, a configuration in which across-sectional shape of an interface between the lower layer part andthe middle layer part taken along a virtual plane perpendicular to thelongitudinal direction of the partition has at least one bent portionmay be employed.

Alternatively, in the display panel of the present disclosure, aconfiguration in which a protective layer covering an entire surfaceincluding spaces between partitions is provided on an upper part of thepartitions, a stacked structure constituting each of the partitionsincludes a material layer constituting an upper layer part and amaterial layer constituting a lower layer part stacked in this orderfrom a display surface side, the material layer constituting the lowerlayer part includes a material having a refractive index higher thanthat of a material of the protective layer, and the material layerconstituting the upper layer part includes a material having arefractive index higher than that of the material of the lower layerpart can be employed.

Alternatively, in the display panel according to the present disclosure,a configuration in which the cross section of each of the partitionstaken along the virtual plane perpendicular to the longitudinaldirection of the partition has a tapered shape with a width increasingtoward the display surface, a protective layer covering an entiresurface including spaces between partitions is provided on an upper partof the partitions, the partitions are each constituted by a singlematerial layer, and a material layer constituting the partitionsincludes a material having a refractive index higher than that of amaterial of the protective layer can be employed.

In the display panel of the present disclosure including any of thepreferred configurations as described above, a configuration in whichthe display elements are formed on a semiconductor substrate, andoptical sensors are respectively formed in association with the displayelements on the semiconductor substrate can be employed.

In addition, in the display panel of the present disclosure includingany of the preferred configurations as described above, a configurationin which the partitions and the optical sensors are arranged so thatstray light from a display element is guided to an optical sensorassociated with the display element and that stray light from a displayelement not being associated with an optical sensor is not guided to theoptical sensor can be employed.

The partitions can be formed with use of materials appropriatelyselected from known inorganic materials and organic materials, by acombination of a known film forming method such as physical vapordeposition methods (PVD methods) exemplified by a vacuum depositionmethod and a sputtering method, various chemical vapor depositionmethods (CVD methods) and the like with a known patterning method suchas an etching method and a liftoff method, for example. In view of theaccuracy of film formation and the control of refractive indices, aninorganic material such as silicon oxide or metal oxide is preferable.

Known sensors such as photodiodes and phototransistors can be used forthe optical sensors. Note that a configuration in which optical sensorsthat are members separate from a display panel are disposed may beemployed, but, in terms of manufacture, it is preferable that aconfiguration in which optical sensors and a display panel areintegrated with use of semiconductor elements of the same type as those(transistors constituting drive circuits for driving light emittingunits, for example) constituting display elements be employed.

A correction luminance unit included in the display device can beconstituted by a computing circuit, a storage device (memory), and thelike, and can be provided with use of known circuit elements and thelike. Note that a power supply unit, a scanning unit, a data driver, andan emission control unit illustrated in FIG. 1 can also be provided withuse of known circuit elements.

A display panel of the present disclosure including the above-describedpreferred configuration may have a so-called monochrome displayconfiguration or may have a color display configuration.

In a case of the color display configuration, one pixel can beconstituted by a plurality of subpixels; specifically, one pixel can beconstituted by three subpixels, which has a red light emitting subpixel,a green light emitting subpixel, and a blue light emitting subpixel.Furthermore, one pixel can be constituted by a set of subpixels obtainedby further adding one or more kinds of subpixels to the three kinds ofsubpixels (for example, a set obtained by adding a subpixel to emitwhite light to improve the luminance, a set obtained by adding asubpixel to emit a complementary color to increase the colorreproduction range, a set obtained by adding a subpixel to emit yellowto increase the color reproduction range, or a set obtained by addingsubpixels to emit yellow and cyan to increase the color reproductionrange).

Examples of the values of pixels of the display device include someresolutions for image display such as (1920, 1035), (720, 480), and(1280, 960) in addition to VGA (640, 480), S-VGA (800, 600), XGA (1024,768), APRC (1152, 900), S-XGA (1280, 1024), U-XGA (1600, 1200), HD-TV(1920, 1080), and Q-XGA (2048, 1536), but the pixel values are notlimited to these values.

In a display device according to the present invention, examples of thelight emitting units constituting the display elements include organicelectroluminescent light emitting units, LED light emitting units, andsemiconductor laser light emitting units. These light emitting units canbe obtained with use of known materials and methods. In terms ofconfiguration of a flat display device, the light emitting units arepreferably constituted by organic electroluminescent light emittingunits. The light emitting units are preferably of a so-calledsurface-emitting type. A light emitting unit with organicelectroluminescence can be constituted by an anode electrode, a holetransport layer, a light emitting layer, an electron transport layer, acathode electrode, and the like.

The display elements constituting the display panel are formed within acertain plane (on a substrate, for example), and a light emitting unitis formed above a drive circuit for driving the light emitting unit withan interlayer insulating layer therebetween, for example.

The configuration of transistors constituting a drive circuit fordriving a light emitting unit is not particularly limited. Thetransistors may be p-channel field-effect transistors or n-channelfield-effect transistors.

Examples of a material for the substrate include a glass material, aplastic material, and a semiconductor material. For example, in a casewhere a drive circuit is constituted by thin film transistors or thelike, the drive circuit can be formed by using a substrate including aglass material or a plastic material and forming a semiconductor film onthe substrate. In contrast, in a case where a drive circuit isconstituted by transistors formed on a semiconductor substrate, aconfiguration in which well regions are formed in the semiconductorsubstrate including silicon, for example, and transistors may be formedin the well regions. Note that various wires in the display elements andthe display panel can have known configurations and structures.

Conditions represented by various expressions in the presentspecification are satisfied in a case where the expressions aresubstantially satisfied, in addition to a case where the expressions arestrictly satisfied in a mathematical sense. For satisfaction of theexpressions, the presence of various variations caused by the design orthe manufacture of the display elements, the display panel, and the likeis allowed. In addition, drawings used in the description below areschematic. For example, FIG. 3, which will be described later,illustrates a cross-sectional structure of a display panel, but does notshow proportions of width, height, thickness, and the like.

First Embodiment

A first embodiment relates to a display panel, a display device, and anelectronic device according to the first aspect of the presentdisclosure.

FIG. 1 is a conceptual diagram of the display device according to afirst embodiment. The display device 1 includes a display panel 2 formedby display elements 3, each including a light emitting unit and a drivecircuit for driving the light emitting unit, arranged in atwo-dimensional matrix, each display elements 3 being connected to ascanning line SCL extending in a row direction (X direction in FIG. 1)and a data line DTL extending in a column direction (Y direction in FIG.1), a luminance correction unit 110 for correcting the luminances of thedisplay elements in display of an image by the display panel bycorrecting the gradation values of video signals, and a data driver 102for applying voltage to the data line DTL.

The display panel 2 is provided with optical sensors 4 associated withthe respective display elements 3. A partition 60 for guiding straylight from the light emitting units to the optical sensors 4 provided onthe display panel 2 is provided between adjacent light emitting units,which will be described in detail later with reference to FIG. 3.

A scanning signal from a scanning unit 101 is supplied to the scanningline SCL. Note that, for convenience of illustration, FIG. 1 illustratesone display element 3, or more specifically, connections of a (q, p)-thdisplay element 3, which will be described later.

The display panel 2 further includes an emission control line CL1 and apower supply line PS1 connected with the display elements 3 arranged inthe row direction, and a common power supply line PS2 connected incommon with all the display elements 3. A control signal from anemission control unit 103 is supplied to the emission control line CL1.A predetermined drive voltage from a power supply unit 100 is suppliedto the power supply line PS1. A common voltage (ground potential, forexample) is supplied to the common power supply line PS2.

Although not illustrated in FIG. 1, an area (display area) in which thedisplay panel 2 displays an image is constituted by a total of Q×Pdisplay elements 3 arranged in a two-dimensional matrix of Q displayelements 3 in the row direction and P display elements in the columndirection. The number of rows of the display elements 3 in the displayarea is P, and the number of display elements 3 constituting each row isQ.

In addition, the number of each of the scanning lines SCL, the powersupply lines PS1, and the emission control lines CL1 is P. Displayelements 3 on the p-th row (where p=1, 2, . . . , P) are connected withthe p-th scanning line SCL_(p), the p-th power supply line PS1 _(p), andthe p-th emission control line CL1 _(p), and constitute one displayelement row. Note that, in FIG. 1, only the scanning line SCL_(p), thepower supply line PS1 _(p), and the emission control line CL1 _(p) areillustrated.

In addition, the number of data lines DTL is Q. Display elements 3 onthe q-th column (where q=1, 2, . . . , Q) are connected with the q-thdata line DTL_(q). Note that only the data line DTL_(q) is illustratedin FIG. 1.

The display device 1 is a monochrome display device, for example, inwhich one display element 3 constitutes one pixel. The display device 1is line-sequentially scanned in units of rows by a scanning signal fromthe scanning unit 101. A display element 3 located on the p-th row andthe q-th column will hereinafter be referred to as the (q, p)-th displayelement 3 or the (q, p)-th pixel.

In the display device 1, the display elements 3 respectivelyconstituting Q pixels arranged on the p-th row are driven at the sametime. In other words, emitting/non-emitting timings of Q displayelements 3 arranged along the row direction are controlled in units ofrows to which the display elements belong. When the display frame rateof the display device 1 is represented by FR (times/second), thescanning period per row (so-called horizontal scanning period) inline-sequential scanning of the display device 1 in units of rows isshorter than (1/FR)×(1/P) seconds.

A video signal D_(Sig) indicating gradation depending on an image to bedisplayed is input to the luminance correction unit 110 of the displaydevice 1 from a device, which is not illustrated, for example. Since thevideo signal D_(Sig) is a signal before being subjected to correction bythe luminance correction unit 110, D_(Sig) may also be referred to as“uncorrected video signal” in the description below. Among video signalsD_(Sig) that are input, a video signal associated with the (q, p)-thdisplay element 3 may be referred to as D_(Sig(q,p)).

For convenience of description, the gradation bit length of the videosignal D_(Sig(q,p)) is assumed to be 11 bits, and the maximum value of acorrection factor [k_((q,p))], which will be described later, is assumedto be “2”. As will be described later, since a corrected video signal isrepresented by k_((q,p))·D_(Sig(q,p)), the gradation value of acorrected video signal is 12 bits at a maximum, and is a value between 0and 4095. Assume here that the luminance of an image to be displayed ishigher as the gradation value is larger. Note that the gradation bitlength mentioned above is merely an example. The gradation bit lengthmay be 8 bits, 16, bits, 24 bits, or the like.

The display elements 3 are each constituted by a light emitting unit ELPand a drive circuit for driving the light emitting unit ELP. The lightemitting unit. ELP is constituted by an organic electroluminescent lightemitting unit. The drive circuit is constituted by: a write transistorTR_(W), a drive transistor TR_(D), and an emission control transistorTR_(EL); and a capacitor C₁ and an auxiliary capacitor C₂. When currentflows to the light emitting unit ELP via a source/drain region of thedrive transistor TR_(D), the light emitting unit ELP emits light. Eachof the transistors is constituted by a p-channel field-effecttransistor. These transistors are provided on a silicon semiconductorsubstrate, which will be described later with reference to FIG. 3.

In a display element 3, a first source/drain region of the drivetransistor TR_(D) is connected with a second source/drain region of theemission control transistor TR_(EL) and a first end of the capacitor C₁,a second source/drain region of the drive transistor TR_(D) is connectedwith a first end (specifically, an anode electrode) of the lightemitting unit ELP, and a gate electrode of the drive transistor TR_(D)is connected with a second source/drain region of the write transistorTR_(W) and a second end of the capacitor C₁.

In addition, a first source/drain region of the write transistor TR_(W)is connected with the data line DTL, and a gate electrode of the writetransistor TR_(W) is connected with the scanning line SCL.

A first source/drain region of the emission control transistor TR_(EL)is connected with the power supply line PS1, and a gate electrode of theemission control transistor TR_(EL) is connected with the emissioncontrol line CL1.

The first end of the capacitor C₁ is further connected with the powersupply line PS1 via the auxiliary capacitor C₂.

A second end (specifically, a cathode electrode) of the light emittingunit ELP is connected with the common power supply line PS2. Apredetermined cathode voltage V_(Cat) is supplied to the common powersupply line PS2. Note that the capacitance of the light emitting unitELP is represented by a symbol C_(EL).

An outline of driving of the display elements 3 will be explained. Whenthe write transistor TR_(W) is switched to a conducting state by ascanning signal from the scanning unit 101 while a voltage depending onthe luminance of an image to be displayed is supplied from the datadriver 102 to the data line DTL, the voltage depending on the luminanceof the image to be displayed is written into the capacitor C₁. After thewrite transistor TR_(W) is switched to a non-conducting state, theemission control transistor TR_(EL1) is switched to a conducting state,and current depending on the voltage held by the capacitor C₁ flows tothe drive transistor TR_(D), which causes the light emitting unit ELP toemit light.

The light emitting characteristics of the display elements 3 vary amongdifferent display elements depending on many factors such as variationin the characteristics of the light emitting units ELP, variation in theresistance of wires connected with the light emitting units ELP, andvariation in the characteristics of transistors constituting the drivecircuits. This causes such a phenomenon as luminance unevenness in animage to be displayed.

Thus, in a case where the light emitting characteristics obtained bydetection of the light emitting states of the light emitting units ELPof the respective display elements vary, the luminance unevenness can bereduced through such processing as multiplication of the gradation valueof the video signal to compensate for the variation.

Operation of the luminance correction unit 110 illustrated in FIG. 1will be described.

FIG. 2 is a block diagram for explaining the luminance correction unitillustrated in FIG. 1.

The luminance correction unit 110 is constituted by blocks such as anA/D converter 110A, a correction value calculation unit 110B, areference value storage table unit 110C, and a multiplication unit 110D.

An optical sensor 4 receive stray light from the light emitting unit ELPof a display element 3. An output from the optical sensor 4 is digitizedby the A/D converter 110A and input to the correction value calculationunit 110B. An uncorrected video signal D_(Sig(q,p)) is further input tothe correction value calculation unit 110B.

The reference value storage table unit 110C stores reference values tobe detected by the optical sensors 4 depending on the value of theuncorrected video signal D_(Sig(q,p)). The correction value calculationunit HOB compares a reference value obtained from the reference valuestorage table unit 110C with a numerical value input from the A/Dconverter to obtain the difference therebetween. A correction factor[k_((q,p))] that compensates for the difference is then calculated, andthe uncorrected video signal D_(Sig(q,p)) is multiplied by thecorrection factor [k_((q,p))] by the multiplication unit 110D. Thecorrected video signal is obtained as k_((q,p))D_(Sig(q,p)).

The data driver 102 then generates a voltage based on the value of thesignal k_((q,p))·D_(Sig(q,p)) to drive the display element 3. In thismanner, the variation in the light emitting characteristics of thedisplay elements 3 can be performed for each of the display elements.

The frequency of calculation of the aforementioned correction factor[k_((q,p))] may be appropriately determined depending on the design andspecification of the display device. For example, a mode in which anentirely white screen is displayed and a correction factor [k_((q,p))]is calculated when the display device is powered on and themultiplication process is only performed thereafter can be employed. Inthis case, the calculated correction factor [k_((q,p))] may be stored ina storage device such as a non-rewritable non-volatile memory, forexample. Alternatively, a mode in which a correction factor [k_((q,p))]is calculated at predetermined intervals during operation of the displaydevice can be employed.

The operation of the luminance correction unit 110 illustrated in FIG. 1has been described above. Next, a structure of the display panel will bedescribed with reference to FIG. 3.

FIG. 3 is a partial schematic cross-sectional view of the display panelof the first embodiment.

The drive transistor TR_(D), the write transistor TR_(W), and theemission control transistor TR_(EL) constituting the drive circuit areprovided in a n-well 11 formed on a surface of semiconductor substrate10 including silicon. Note that, for convenience of illustration, onlythe drive transistor TR_(D) is illustrated. These transistors aresurrounded by an element isolation region 12. A reference numeral 21represents a gate electrode of the drive transistor TR_(D), and areference numeral 22 represents a gate insulating film of the drivetransistor TR_(D).

The optical sensor 4 on the display panel are also provided in then-well 11 similarly to the transistors constituting the drive circuit.The optical sensors 4 are constituted by photodiodes. The opticalsensors 4 are also surrounded by the element isolation region 12. Forconvenience of illustration, connections between the optical sensors 4and the luminance correction unit 110 illustrated in FIG. 1 are notillustrated. The display elements 3 are formed on the semiconductorsubstrate 10, and the optical sensor 4 are formed on the semiconductorsubstrate 10 in association with the respective display elements 3. Inaddition, the partitions 60 and the optical sensors 4 are arranged sothat stray light from a display element 3 is guided to the opticalsensor 4 associated with the display element 3 and that stray light froma display element 3 that is not associated with an optical sensor 4 isnot guided to the optical sensor 4.

The first source/drain region of the drive transistor TR_(D) isconnected with electrodes 31 constituting wires, capacitors, or the likevia contact holes 30. Reference numerals 41, 42, 43, 44, and 45represent interlayer insulating layers. Anode electrodes 51 of the lightemitting units ELP corresponding to the respective display elements 3are formed on the interlayer insulating layer 45. The anode electrodes51 are arranged in a two-dimensional matrix on the interlayer insulatinglayer 45. A reference numeral 46 represents an insulating layer fillinga space between the anode electrodes 51. The anode electrodes 51 andsecond source/drain regions of the drive transistors TR_(D) areconnected with each other via contact holes and the like formed in theinterlayer insulating layers 41, 42, 43, 44, and 45. Regions in whichthe anode electrodes 51 are provided correspond to regions in which thelight emitting units ELP are formed.

In addition, partitions 60 for guiding stray light from the lightemitting units ELP to the optical sensors 4 provided on the displaypanel are provided between adjacent light emitting units ELP. In theexample illustrated in FIG. 3, the cross sections of the partitions 60taken along a virtual plane perpendicular to the longitudinal directionof the partitions 60 have a tapered shape with the width decreasingtoward the display surface (toward the +Z direction in FIG. 3). Thepartitions 60 include inorganic oxide such as silicon oxide or aluminumoxide.

In a case of a display panel having a small size and a high definitionspecification, the widths of the light emitting units ELP and thepartitions 60 in the X direction and the heights of the partitions 60 inthe Z direction nave values of several μm, for example.

An organic layer 71 including light emitting layers is formed to coverthe entire surface including the partitions 60 described above. Notethat the organic layer 71 has a multilayer structure included a redlight emitting layer, a green light emitting layer, a blue lightemitting layer, and the like, but is depicted as one layer in FIG. 3. Inaddition, a cathode electrode 72 is formed on the entire surface of theorganic layer 71. The cathode electrode 72 includes a transparentconducting material such as ITO or IZO, or a material such as MgAg, forexample. A protective layer 80 is provided on the cathode electrode 72and covers the entire surface including spaces between the partitions60. Note that, in a case of color display, color filters are provided onthe protective layer 80 and in association with the respective lightemitting units ELP.

Note that the partitions 60 may be in a grid-like shape or in aband-like shape. In the case of a grid-like shape, the partitions 60 mayhave a shape surrounding all four sides of an ELP region in a continuousmanner or in a discontinuous manner. In the case of a band-like shape,the partitions 60 may have a continuous shape or a discontinuous shape.

In the example illustrated in FIG. 3, the partitions 60 are constitutedby a stacked structure of two or more layers. More specifically, thestacked structure constituting the partitions 60 includes a materiallayer 63 constituting an upper layer part, a material layer 62constituting a middle layer part, and a material layer 61 constituting alower layer part, which are stacked in this order from the displaysurface side.

In addition, the material layer 63 constituting the upper layer partincludes a material having a refractive index lower than that of thematerial of the protective layer 80, and the material layer 61constituting the lower layer part includes a material having arefractive index higher than that of the material of the protectivelayer 80. Furthermore, the material layer 62 constituting the middlelayer part includes a material having a refractive index lower than thatof the material of the lower layer part 61. For example, the materiallayer 61 includes SiN, the material layer 62 includes SiON, and thematerial layer 63 includes SiO. Note that the protective layer 80includes SiN.

Processes for forming the partitions 60 will be described with referenceto FIGS. 4 and 5. The material layer 61, the material layer 62, and thematerial layer 63 are sequentially stacked by a known film formingtechnology such as the CVD method, for example, over the entire surfaceincluding the anode electrode 51 and the insulating layer 46 (see FIGS.4A and 4B).

Subsequently, masks 90 are formed on the material layer 63 at positionscorresponding to those of the partitions 60, and a dry etching process,for example, is then performed (see FIG. 5A). The process is performedunder the condition that overetching occurs, so that the partitions 60including the material layer 61, the material layer 62, and the materiallayer 63 and having a tapered shape are formed at the positions of themasks 90 (see FIG. 5B).

The production of the display elements 3 described above can beconducted on the basis of a known method, and the materials used for theproduction of the display elements 3 can be appropriately selected fromknown materials.

Next, the relation between a partition 60 and the associated opticalsensor 4 will be described.

As illustrated in FIG. 3, in addition to stray light (depicted by asolid line) from the light emitting unit ELP associated with the opticalsensor 4, stray light (depicted by a broken line) from a light emittingunit ELP of an adjacent display element 3 enters the partition 60. Thestray light beams are reflected by an interface between the materiallayer 61 and the material layer 62 and directed toward the semiconductorsubstrate 10.

Although it depends on the thicknesses of the interlayer insulatinglayers and the like, a difference occurs between the position at whichthe stray light from the light emitting unit ELP associated with theoptical sensor 4 is incident on the semiconductor substrate 10 and theposition at which stray light from the light emitting unit ELP of theadjacent display element 3 is incident on the semiconductor substrate10. Thus, the optical sensor 4 is disposed at the position at which thestray light depicted by the solid line is incident, which suppresses theinfluence of the stray light from the adjacent light emitting unit ELPon a detection result of the optical sensor 4.

Next, positioning of the middle layer of the partition 60 will bedescribed.

FIG. 6 is a partial schematic cross-sectional view of the display panelfor explaining the relation between stray light from the light emittingunit and the middle layer part of the partition. FIG. 7 is a partialschematic cross-sectional view of the display panel for explaining therelation between stray light from the light emitting unit and the middlelayer part of the partition following FIG. 6. Note that, for convenienceof description, hatching other than that for the anode electrode 51 isomitted in FIGS. 6 and 7. The same applies to other subsequent drawings.

The refractive index of the protective layer 80 covering the partition60 is represented by a symbol n₁, the refractive index of the upperlayer part of the partition 60 is represented by a symbol n₂, therefractive index of the middle layer part is represented by a symbol n₃,and the refractive index of the lower layer part is represented by asymbol n₄. As described above, the material layer 63 constituting theupper layer part includes a material having a refractive index lowerthan that of the material of the protective layer 80, and the materiallayer 61 constituting the lower layer part includes a material having arefractive index higher than that of the material of the protectivelayer 80. Thus, the symbol n₂<the symbol n₁, and the symbol n₁<thesymbol n₄ are satisfied. Furthermore, since the material layer 62constituting the middle layer part includes a material having arefractive index lower than that of the material of the lower layer part61, the symbol n₃<the symbol n₄ is satisfied.

According to the Snell's law, incidence and exit of light on/from thepartition 60 do not depend on the structures of the organic layer andthe cathode electrode. Light incident on an inclined surface of thematerial layer 61 constituting the lower layer part is guided into thematerial layer 61, totally reflected at the interface between thematerial layer 62 and the material layer 61, and directed toward thesemiconductor substrate. In contrast, light incident on an inclinedsurface of the material layer 63 constituting the upper layer part islikely to be totally reflected toward the display surface.

Thus, in a case where priority is given to the intensity of light on thedisplay surface side, the upper layer part may be set to be relativelythicker than the lower layer part as illustrated in FIG. 6. In otherwords, the proportion of the height DZ₂ of the lower layer part to theheight DZ₁ of the partition 60 illustrated in FIG. 6 may be set to besmall. Conversely, in a case where priority is given to detection ofstray light, the lower layer part may be set to be thicker asillustrated in FIG. 7. In other words, the proportion of the height DZ₂of the lower layer part to the height DZ₁ of the partition 60illustrated in FIG. 6 may be set to be large.

Second Embodiment

A second embodiment is different from the first embodiment in that therefractive index of the lower layer part of the partition 60 isdifferent. The configuration of the second embodiment other than theabove is similar to that of the first embodiment.

FIG. 8 is a partial schematic cross-sectional view of a display panelfor explaining a partition of the second embodiment.

In the second embodiment, the material layer constituting the upperlayer part of the partition 60 includes a material having a refractiveindex higher than that of the material of the protective layer 80, thematerial layer constituting the lower layer part includes the samematerial as the upper layer part, the material layer constituting themiddle layer part includes a material having a refractive index higherthan that of the material of the upper layer part and the lower layerpart.

Thus, the refractive indices of the protective layer 80, and the upperlayer part and the middle layer part of the partition 60 are representedby the symbol n₁, the symbol n₂, and the symbol n₃, similarly to thefirst embodiment. In contrast, the refractive index of the lower part ofthe partition 60 is represented by the symbol n₂. With thisconfiguration as well, stray light from, the light, emitting unit ELPcan be captured to some extent, and the stray light can thus be guidedto the optical sensor 4.

Since the upper layer part and the lower layer part of the partition 60can be formed through processes using the same material, the secondembodiment is advantageous in that the processes can be simplified.

Third Embodiment

A third embodiment is different from the first embodiment and the secondexample in that interfaces between the layers of the partition 60 havebent portions. More specifically, the cross-sectional shape of theinterface between the lower layer part and the middle layer part takenalong a virtual plane perpendicular to the longitudinal direction of thepartition 60 has at least one bent portion. The configuration of thethird embodiment other than the above is similar to those of the firstembodiment and the second embodiment.

FIG. 9 is a partial schematic cross-sectional view of a display panelfor explaining a partition of the third embodiment.

In the example illustrated in FIG. 6 or the like, the lower layer partof the partition 60 has a flat upper surface, and the middle layer partis formed to cover the flat upper surface. Thus, the interface betweenthe lower layer part and the middle layer part is also flat. Incontrast, as illustrated in FIG. 9, the upper surface of the lower layerpart of the partition 60 has a shape pointed toward the display surfacein the third embodiment. Since the middle layer part is formed to coverthe pointed upper surface, the cross-sectional shape of the interfacebetween the lower layer part and the middle layer part has a bentportion.

Processes for forming the partition 60 will be described with referenceto FIGS. 10A to 10C. After the material layer 61 is stacked over theentire surface including the anode electrode 51 and the insulating layer46, and after masks 91 are formed on the material layer 61 at positionscorresponding to those of the partitions 60, a dry etching process, forexample, is then performed (see FIGS. 10A and 10B).

The process is performed under the condition that overetching occurs, sothat portions in the shade of the masks 91 are also subjected toetching, which results in that the upper surface of the lower layer partof the partition 60 has a shape pointed toward the display surface.

Thereafter, the material layer 62 and the material layer 63 aresequentially stacked over the entire surface by a known film formingtechnology, and a process similar to that described with reference toFIGS. 5A and 5B in the first embodiment is then performed, so that thepartition 60 is formed.

In the third embodiment, the inclination of an interface at which lightis reflected can be changed, so that the direction in which stray lightis reflected is changed. Thus, such an effect as an increase inflexibility of positioning of the optical sensors is produced.

The third embodiment can be modified in various manners. FIGS. 11 to 13are partial schematic cross-sectional views of display panels forexplaining partitions according to modifications of the thirdembodiment. The modifications will hereinafter be described withreference to FIGS. 11 to 13.

An example illustrated in FIG. 11 is a modification in which the uppersurface of the lower layer part of the partition 60 has a rounded convexshape. For example, the upper surface of the lower layer part of thepartition 60 can be formed into a rounded shape by such a process asrounding an edge by chemical processing or the like after the processillustrated in FIG. 10C. FIG. 12 illustrates a modification in which theupper surface of the lower layer part of the partition 60 has a shapebent toward the side opposite to the display surface, and FIG. 13illustrates a modification in which the bent shape is further a roundedbent shape. In these modifications as well, the direction in which straylight is reflected can be changed.

Fourth Embodiment

A fourth embodiment is different from the first embodiment and otherembodiments in that the stacked structure constituting the partition 60includes a material layer constituting an upper layer part and amaterial layer constituting a lower layer part, which are stacked inthis order from the display surface side.

FIG. 14 is a partial schematic cross-sectional view of a display panelfor explaining a partition of the second embodiment.

A protective layer 80 covering the entire surface including spacesbetween the partitions 60 similarly to the other embodiments is providedon an upper part of the partition 60. The stacked structure constitutingthe partition 60 includes a material layer constituting an upper layerpart and a material layer constituting a lower layer part, which arestacked in this order from the display surface side, in which thematerial layer constituting the lower layer part includes a materialhaving a refractive index higher than that of the material of theprotective layer 80, and the material layer constituting the upper layerpart includes a material having a refractive index higher than that ofthe material of the lower layer part. In other words, the stackedstructure is such that the upper layer part in the first embodiment andother embodiments is omitted, and the middle layer in the firstembodiment and other embodiments serves as an upper layer part.

This configuration allows the inclined surface of the lower layer partto be longer than that in the first embodiment. Thus, this isadvantageous in that the extent to which stray light is captured in thepartition is increased.

Fifth Embodiment

A fourth embodiment is different from the first embodiment and otherembodiments, in that the cross sections of the partitions 60 taken alonga virtual plane perpendicular to the longitudinal direction of thepartitions 60 have a tapered shape with the width increasing toward thedisplay surface.

FIG. 15 is a partial schematic cross-sectional view of a display panelfor explaining a partition of the fifth embodiment.

This configuration corresponds to a configuration obtained by changingthe partition 60 in the first embodiment into a reversely tapered shape.Such partitions 60 can be obtained by changing the flow rate and thedirection of etching gas in the etching process described with referenceto FIG. 5A. Thus, the formation of the partitions 60 into the reverselytapered shape increases the extent to which stray light is captured inthe partitions.

Sixth Embodiment

A sixth embodiment is characterized in that the cross sections of thepartitions 60 taken along a virtual plane perpendicular to thelongitudinal direction of the partitions 60 have a tapered shape withthe width increasing toward the display surface, and in that thepartitions 60 are each constituted by a single material layer.

FIG. 16 is a partial schematic cross-sectional view of a display panelfor explaining a partition of the sixth embodiment.

The cross section of the partition 60 taken along a virtual planeperpendicular to the longitudinal direction of the partition 60 has atapered shape with the width increasing toward the display surface. Aprotective layer 80 covering the entire surface including spaces betweenthe partitions 60 similarly to the other embodiments is provided on anupper part of the partition 60. In addition, the partition 60 isconstituted by a single material layer, and the material layerconstituting the partition 60 includes a material having a refractiveindex higher than that of the material of the protective layer 80.

With this configuration as well, the formation of the partitions 60 intothe reversely tapered shape increases the extent to which stray light iscaptured in the partitions. In addition, this is advantageous in thatthe partitions 60 can be made of a single material.

[Electronic Device]

The display devices according to the present disclosure can be used fordisplay units (display devices) of electronic devices in all fields fordisplaying a video signal input to the electronic devices or a videosignal generated in the electronic devices in the form of an image orvideo. For example, the display devices can be used for display units oftelevision sets, digital still cameras, notebook-sized personalcomputers, portable terminal devices such as mobile phones, videocameras, head mounted displays (displays worn on the head), and thelike.

The display devices of the present disclosure include those of a modularform having a sealed configuration. For example, a display module formedby adhering a part including transparent glass or the like opposed to apixel array part to the pixel array part is applicable. Note that adisplay module may be provided with a circuit unit, a flexible printedcircuit (FPC) or the like for inputting and outputting signals to apixel array part from outside. Hereinafter, a digital still camera and ahead mounted display will be presented as examples of an electronicdevice having a display device of the present disclosure. Note that theexamples presented here are merely exemplary, and the present disclosureis not limited thereto.

Example 1

FIG. 17 illustrates external views of a single-lens reflex digital stillcamera with interchangeable lenses, in which FIG. 17A is a front viewthereof and FIG. 17B is a rear view thereof. The single-lens reflexdigital still camera with interchangeable lenses has an interchangeablephotographing lens unit (interchangeable lens) 312 on the right side atthe front of a camera body part (camera body) 311, and a grip part 313to be gripped by a photographer, for example.

In addition, a monitor 314 is provided approximately at the center of arear face of the camera body part 311. A viewfinder (eyepiece window)315 is provided, above the monitor 314. A photographer can view anoptical image of a subject provided through the photographing lens unit312 and determine the composition by looking through the viewfinder 315.

In the single-lens reflex digital still, camera with interchangeablelenses having the configuration described above, a display device of thepresent disclosure can be used for the viewfinder 315. Thus, thesingle-lens reflex digital still, camera with interchangeable lensesaccording to the present example is fabricated with use of a displaydevice of the present disclosure as the viewfinder 315.

Example 2

FIG. 18 is an external view of a head, mounted display. The head mounteddisplay has ear worn parts 412 for mounting on the head of a user onboth sides of a glasses type display unit 411, for example. In the headmounted display, a display device of the present disclosure can be usedfor the display unit 411. Thus, the head mounted display according tothe present example is fabricated with used of a display device of thepresent disclosure as the display unit 411.

Example 3

FIG. 19 is an external view of a see-through head mounted display. Thesee-through head mounted display 511 is constituted by a body part 512,an arm 513, and a lens barrel 514.

The body part 512 is connected with the arm 513 and eyeglasses 500.Specifically, an end of the body part 512 in the longitudinal directionis coupled with the arm 513, and one side surface of the body part 512is coupled with the eyeglasses 500 with a connection membertherebetween. Note that the body part 512 may be directly mounted on ahuman head.

The body part 512 includes a control board for controlling the operationof the see-through head mounted display 511 and a display unit. The arm513 connects the body part 512 with the lens barrel 514, and supportsthe lens barrel 514. Specifically, the arm 513 is coupled with an end ofthe body part 512 and with an end of the lens barrel 514 to fix the lensbarrel 514. In addition, the arm 513 includes a signal line forcommunication of data on images provided from the body part 512 to thelens barrel 514.

The lens barrel 514 emits image light, which is provided from the bodypart 512 via the arm 513, through an eyepiece toward the eyes of theuser wearing the see-through head mounted display 511 In the see-throughhead mounted display 511, a display device of the present disclosure canbe used for the display unit of the body part 512.

[Others]

It should be noted that the present disclosure may also be embodied inthe configurations below.

[1]

A display panel including display elements each including a lightemitting unit and a drive circuit for driving the light emitting unit,the display elements being arranged in a two-dimensional matrix on asubstrate,

in which a partition for guiding stray light from a light emitting unitto an optical sensor provided on the display panel is provided betweenadjacent light emitting units.

[2]

The display panel according to [1],

in which a cross section of each of the partitions taken along a virtualplane perpendicular to a longitudinal direction of the partition has atapered shape with a width decreasing toward a display surface or atapered shape with a width increasing toward the display surface.

[3]

The display panel according to [2],

in which the partitions each have a stacked structure of two or morelayers.

[4]

The display panel according to [3],

in which a protective layer covering an entire surface including spacesbetween partitions is provided on an upper part of the partitions, and

a stacked structure constituting each of the partitions includes amaterial layer constituting an upper layer part, a material layerconstituting a middle layer part, and a material layer constituting alower layer part stacked in this order from a display surface side.

[5]

The display panel according to [4],

in which the material layer constituting the upper layer part includes amaterial having a refractive index lower than that of a material of theprotective layer, and

the material layer constituting the lower layer part includes a materialhaving a refractive index higher than that of the material of theprotective layer.

[6]

The display panel according to [5],

in which the material layer constituting the middle layer part includesa material having a refractive index lower than that of the material ofthe lower layer part.

[7]

The display panel according to [4],

in which the material layer constituting the upper layer part includes amaterial having a refractive index higher than that of the protectivelayer,

the material layer constituting the lower layer part includes the samematerial as the upper layer part, and

the material layer constituting the middle layer part includes amaterial having a refractive index higher than that of the material ofthe upper layer part and the lower layer part.

[8]

The display panel according to any one of [4] to [7],

in which a cross-sectional shape of an interface between the lower layerpart and the middle layer part taken along a virtual plane perpendicularto the longitudinal direction of the partition has at least one bentportion.

[9]

The display panel according to [2],

in which a protective layer covering an entire surface including spacesbetween partitions is provided on an upper part of the partitions,

a stacked structure constituting each of the partitions includes amaterial layer constituting an upper layer part and a material layerconstituting a lower layer part stacked in this order from a displaysurface side,

the material layer constituting the lower layer part includes a materialhaving a refractive index higher than that of a material of theprotective layer, and

the material layer constituting the upper layer part includes a materialhaving a refractive index higher than that of the material of the lowerlayer part.

[10]

The display panel according to [2],

in which the cross section of each of the partitions taken along thevirtual plane perpendicular to the longitudinal direction of thepartition has a tapered shape with a width increasing toward the displaysurface,

a protective layer covering an entire surface including spaces betweenpartitions is provided on an upper part of the partitions,

the partitions are each constituted by a single material layer, and

a material layer constituting the partitions includes a material havinga refractive index higher than that of a material of the protectivelayer.

[11]

The display panel according to any one of [1] to [10],

in which the display elements are formed on a semiconductor substrate,and

optical sensors are respectively formed in association with the displayelements on the semiconductor substrate.

[12]

The display panel according to any one of [1] to [11],

in which the partitions and the optical sensors are arranged so thatstray light from a display element is guided to an optical sensorassociated with the display element and that stray light from a displayelement not being associated with an optical sensor is not guided to theoptical sensor.

[13]

A display device including:

a display panel including display elements each including a lightemitting unit, and a drive circuit for driving the light emitting unit,the display elements being arranged in a two-dimensional matrix on asubstrate; and

a luminance correction unit for correcting luminances of the displayelements in display of an image by the display panel by correcting agradation value of a video signal,

in which a partition for guiding stray light from a light emitting unitto an optical sensor provided on the display panel is provided betweenadjacent light emitting units of the display panel, and

the luminance correction unit corrects a gradation value of a videosignal associated with each of the display elements on the basis of agradation value of an uncorrected video signal and a detection resultfrom the optical sensor.

[14]

The display device according to [13],

in which a cross section of each of the partitions taken along a virtualplane perpendicular to a longitudinal direction of the partition has atapered shape with a width decreasing toward a display surface or atapered shape with a width increasing toward the display surface.

[15]

The display device according to [14],

in which the partitions each have a stacked structure of two or morelayers.

[16]

The display device according to [15],

in which a protective layer covering an entire surface including spacesbetween partitions is provided on an upper part of the partitions, and

a stacked structure constituting each of the partitions includes amaterial layer constituting an upper layer part, a material layerconstituting a middle layer part, and a material layer constituting alower layer part stacked in this order from a display surface side.

[17]

The display device according to [16],

in which the material layer constituting the upper layer part includes amaterial having a refractive index lower than that of a material of theprotective layer, and

the material layer constituting the lower layer part includes a materialhaving a refractive index higher than that of the material of theprotective layer.

[18]

The display device according to [17],

in which the material layer constituting the middle layer part includesa material having a refractive index lower than that of the material ofthe lower layer part.

[19]

The display device according to [16],

in which the material layer constituting the upper layer part includes amaterial having a refractive index higher than that of the protectivelayer,

the material layer constituting the lower layer part includes the samematerial as the upper layer part, and

the material layer constituting the middle layer part includes amaterial having a refractive index higher than that of the material ofthe upper layer part and the lower layer part.

[20]

The display device according to any one of [16] to [19],

in which a cross-sectional shape of an interface between the lower layerpart and the middle layer part taken along a virtual plane perpendicularto the longitudinal direction of the partition has at least one bentportion.

[21]

The display device according to [14],

in which a protective layer covering an entire surface including spacesbetween partitions is provided on an upper-part of the partitions,

a stacked structure constituting each of the partitions includes amaterial layer constituting an upper layer part and a material layerconstituting a lower layer part stacked in this order from a displaysurface side,

the material layer constituting the lower layer part includes a materialhaving a refractive index higher than that of a material of theprotective layer, and

the material layer constituting the upper layer part includes a materialhaving a refractive index higher than that of the material of the lowerlayer part.

[22]

The display device according to [14],

in which the cross section of each of the partitions taken along thevirtual plane perpendicular to the longitudinal direction of thepartition has a tapered shape with a width increasing toward the displaysurface,

a protective layer covering an entire surface including spaces betweenpartitions is provided on an upper part of the partitions,

the partitions are each constituted by a single material layer, and

a material layer constituting the partitions includes a material havinga refractive index higher than that of a material of the protectivelayer.

[23]

The display device according to any one of [13] to [22],

in which the display elements are formed on a semiconductor substrate,and

optical sensors are respectively formed in association with the displayelements on the semiconductor substrate.

[24]

The display device according to any one of [13] to [23],

in which the partitions and the optical sensors are arranged so thatstray light from a display element is guided to an optical sensorassociated with the display element and that stray light from a displayelement not being associated with an optical sensor is not guided to theoptical sensor.

[25]

An electronic device including a display device,

in which the display device includes:

a display panel including display elements each including a lightemitting unit and a drive circuit for driving the light emitting unit,the display elements being arranged in a two-dimensional matrix on asubstrate; and

a luminance correction unit for correcting luminances of the displayelements in display of an image by the display panel by correcting agradation value of a video signal,

in which a partition for guiding stray light from a light emitting unitto an optical sensor provided on the display panel is provided betweenadjacent light emitting units of the display panel, and

the luminance correction unit corrects a gradation value of a videosignal associated with each of the display elements on the basis of agradation value of an uncorrected video signal and a detection resultfrom the optical sensor.

[26]

The electronic device according to [25],

in which a cross section of each of the partitions taken along a virtualplane perpendicular to a longitudinal direction of the partition has atapered shape with a width decreasing toward a display surface or atapered shape with a width increasing toward the display surface.

[27]

The electronic device according to [26],

in which the partitions each have a stacked structure of two or morelayers.

[28]

The electronic device according to [27],

in which a protective layer covering an entire surface including spacesbetween partitions is provided on an upper part of the partitions, and

a stacked structure constituting each of the partitions includes amaterial layer constituting an upper layer part, a material layerconstituting a middle layer part, and a material layer constituting alower layer part stacked in this order from a display surface side.

[29]

The electronic device according to [28],

in which the material layer constituting the upper layer part includes amaterial having a refractive index lower than that of a material of theprotective layer, and

the material layer constituting the lower layer part includes a materialhaving a refractive index higher than that of the material of theprotective layer.

[30]

The electronic device according to [29],

in which the material layer constituting the middle layer part includesa material having a refractive index lower than that of the material ofthe lower layer part.

[31]

The electronic device according to [28],

in which the material layer constituting the upper layer part includes amaterial having a refractive index higher than that of the protectivelayer,

the material layer constituting the lower layer part includes the samematerial as the upper layer part, and

the material layer constituting the middle layer part includes amaterial having a refractive index higher than that of the material ofthe upper layer part and the lower layer part.

[32]

The electronic device according to any one of [28] to [31],

in which a cross-sectional shape of an interface between the lower layerpart and the middle layer part taken along a virtual plane perpendicularto the longitudinal direction of the partition has at least one bentportion.

[33]

The electronic device according to [26],

in which a protective layer covering an entire surface including spacesbetween partitions is provided on an upper part of the partitions,

a stacked structure constituting each of the partitions includes amaterial layer constituting an upper layer part and a material layerconstituting a lower layer part stacked in this order from a displaysurface side,

the material layer constituting the lower layer part, includes amaterial having a refractive index higher than that of a material of theprotective layer, and

the material layer constituting the upper layer part includes a materialhaving a refractive index higher than that of the material of the lowerlayer part.

[34]

The electronic device according to [26],

in which the cross section of each of the partitions taken along thevirtual plane perpendicular to the longitudinal direction of thepartition has a tapered shape with a width increasing toward the displaysurface,

a protective layer covering an entire surface including spaces betweenpartitions is provided on an upper part of the partitions,

the partitions are each constituted by a single material layer, and

a material layer constituting the partitions includes a material havinga refractive index higher than that of a material of the protectivelayer.

[35]

The electronic device according to any one of [25] to [34],

in which the display elements are formed on a semiconductor substrate,and

optical sensors are respectively formed in association with the displayelements on the semiconductor substrate.

[36]

The electronic device according to any one of [25] to [35],

in which the partitions and the optical sensors are arranged so thatstray light from, a display element is guided to an optical sensorassociated with the display element and that stray light from a displayelement not being associated with an optical sensor is not guided to theoptical sensor.

REFERENCE SIGNS LIST

-   1 Display device-   2 Display panel-   3 Display element-   4 Optical sensor-   10 Semiconductor substrate-   11 Well-   12 Element isolation region-   21 Gate electrode of drive transistor-   22 Gate insulating layer of drive transistor-   30 Contact hole-   31 Electrode constituting wire or capacitor-   41, 42, 43, 44, 45-   46 Insulating layer or interlayer insulating layer-   51 Anode electrode of light emitting unit-   60 Partition-   61 Lower layer part of partition-   62 Middle layer part of partition-   63 Upper layer part of partition-   71 Organic layer-   72 Cathode electrode-   80 Protective layer (flattening film)-   90, 91 Mask-   100 Power supply unit-   101 Scanning unit-   102 Data driver-   103 Emission control unit-   110 Luminance correction unit-   110A A/D converter-   110B Correction value calculation unit-   110C Reference value storage table unit-   110D Multiplication unit-   311 Camera body part-   312 Photographing lens unit-   313 Grip part-   314 Monitor-   315 Viewfinder-   500 Eyeglasses-   511 See-through head mounted display-   512 Body part-   513 Arm-   514 Lens barrel-   TR_(W) Write transistor-   TR_(D) Drive transistor-   TR_(EL) Emission control transistor-   C₁ Capacitor-   C₂ Auxiliary capacitor-   ELP Organic electroluminescent light emitting unit-   C_(EL) Capacitance of light emitting unit ELP-   SCL Scanning line-   DTL Data line-   PS1 Power supply line-   PS2 Common power supply line-   CL1 Emission control line

The invention claimed is:
 1. A display panel comprising: a partitionbetween a light emitting unit and an adjacent light emitting unit, amiddle layer part of the partition is between an upper layer part of thepartition and a lower layer part of the partition; and a protectivelayer that covers the partition, a refractive index of the upper layerpart is lower than a refractive index of the protective layer.
 2. Thedisplay panel according to claim 1, wherein a refractive index of thelower layer part is higher than the refractive index of the protectivelayer.
 3. The display panel according to claim 2, wherein a refractiveindex of the middle layer part is lower than the refractive index of thelower layer part.
 4. The display panel according to claim 2, wherein thepartition has a tapered shape in a cross section of the display panel, awidth of the tapered shape increases from the lower layer part to theupper layer part or decreases from the lower layer part to the upperlayer part.
 5. The display panel according to claim 1, furthercomprising: an optical sensor configured to receive stray light that isemitted from the light emitting unit.
 6. The display panel according toclaim 5, wherein the light emitting unit is between the protective layerand an optical sensor.
 7. The display panel according to claim 1,further comprising: an adjacent optical sensor configured to receivestray light that is emitted from the adjacent light emitting unit. 8.The display panel according to claim 7, wherein the adjacent lightemitting unit is between the protective layer and the adjacent opticalsensor.
 9. A display device comprising: the display panel according toclaim 1; and a luminance correction unit configured to correct aluminance of the light emitting unit.
 10. An electronic devicecomprising: the display device according to claim 9, wherein the displaypanel comprises a drive circuit that is configured to drive the lightemitting unit and the adjacent light emitting unit.